The class Mammalia has three unique characteristics: hair, milk production in the mammary glands and three bones in the middle ear. Characteristics shared by other classes of animals include a warm-blooded metabolism, four-chambered heart and four limbs. Members of class Mammalia are called mammals.
Most mammals give birth to live young; the exceptions to this are five species of egg-laying mammals called monotremes. The platypus and four species of echidna are the only living monotremes, as of 2014. Marsupials are a group of mammal species that give birth to less-developed live young that cannot survive away from the mother. Newborn marsupials continue to grow in an pouch outside of the mother's body. Kangaroos, koalas, opossums and wallabies are all examples of marsupials.
Mammals live on every continent and range in size from the 3-centimeter bumblebee bat to the 108-foot blue whale. They vary greatly in diet and habitat. There are herbivorous, carnivorous and omnivorous mammals, and mammals that live on land, underwater or both. Bats are the only mammals with the true ability to fly, but some other mammals glide between trees. Cetaceans, the group that includes dolphins and whales, are the only mammals that live exclusively underwater, but mammals such as seals and otters are able to move between land and water easily.Learn More
The characteristics that all living things share are cells, growth, reproduction, adaptation, homeostasis, use of energy and response to the environment. Using these characteristics, it is easy to determine if something is living, dead or non-living.Full Answer >
Fungi are eukaryotes. They reproduce by means of spores, and they reproduce both sexually and asexually. They are nonvascular, and they are heterotrophic. Fungi store their food as starch. They have a small nucleus. They digest their food before they ingest it. They are nonmotile. They have cell walls composed of chitin.Full Answer >
Sponges are extremely slow-moving or sessile filter-feeders that draw water through pores and specialized filter cells to gather food. Sponges are the most primitive type of animal in existence, featuring a cell-based organization where different cells have different tasks, but do not form tissues. All sponges live in the water, with a large majority of species living in the oceans.Full Answer >
The main characteristics of chlamydomnas are their single-cell status, two flagella, hardiness and simple genetic makeup. Chlamydomnas make excellent research models to demonstrate how biological organisms operate.Full Answer >